ML20100R427
| ML20100R427 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/20/1992 |
| From: | Holzman P NUCLEAR UTILITY GROUP ON EQUIPMENT QUALIFICATION |
| To: | |
| References | |
| CIVP-A-109, NUDOCS 9204090114 | |
| Download: ML20100R427 (60) | |
Text
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9 May 7, 1986 13 F5:Ir. F004
. EL3586-017 Mr. Joseph B. Drab Special Projects Engineer Limitorque Corporation 5114 Woodall Road Lynchburg, VA 24506
Dear Joe:
Enclosedeplease find a Nuclear Utility Group on Equipment Qualification (NUGEQ) document on Limitorque actuator environmental qualification. The document has been prepared by the Group based on our discussions with Limitorque and the contents of the referenced Limitorque reports. The Group requests Limitorque's review and corr. ment on this material. The objective of our efforts has been to clarify various ( topics which have been raised 'by Group members related to the actual testing performed by Limitorque. In addition, the Group has an interest in Limitorque/s design, testing and manufacturing experience, and any feedback on field experience which would aid utilities in the application of your reports and other qualification data to' installed actuators requiring environmental qualification to 10 CFR 50.49. The Group would appreciate your prompt attention and response. On behalf of the Group, I want to thank you and Limitorque for the time and effort associated sith providing this iniormation. Very truly yourg,
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NUCLEAR UTILITY GROUP ON COUIPMEN TOUALIFICATION
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MEMORANDUM TO: Nuclear' Utility Group on Equipment Qualification FROM: Philip M. Holzma
SUBJECT:
Issuance of the NUGEQ Report on Limitorrue EQ Clarifications Attached please find a NUGEQ report titled, " Clarification of Information Related to the Environmental Qualification of Limitorque Motorized Valve Operators," which docume..ts the (- Feetinganddiscussionshelgon behalf or the Group during March and April with Limitorque. The clarifications presented in this report address actual test. configurations and other analysis and experience which Limitorque uses to sJpport environmental qualification of its actuators. Limitorque and the Group members agreed that case-by-case considerations, other qualification test data, and utility specific analysis are used in combination with the referenced Limitorque reports to support actuator environmental qualification. Thetefore, clarifications contained l in this docunent do not fully reflect the final qualification i evaluations which apply to installed Limitorque actuators. If additional information is required, please contact Limitotque or the KUGEQ subcommittee involved in the Limitorque I otscussions. PMH/ak
Attachment:
Clarification of Information Related to the l Environmental Qualification of Limitorque Motorizeti valve operators 1 1/The NUGEQ subcommittee involved in the Limitorque discussions l (, i included: Paul Conner - VEPCO; Pedro Salas - CPLL: John Nicosia - NEU; Phil Holzman - EPM; and Bob Phillips - j _ Westinghouse for CPLL. 1
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4.r , () TABLE OF CONTENTS 0064631 SECTION TITLE PAGE Introduction............................... i l TABLE 1.................................... iv l
. 1. ,
Actuator Size .............................< 1
- 2. Orientation ............................... 2
- 3. Motor, size / Manufacturer ................... 3
- 4. Motor Orientation /T-Drains ................ 5
- 5. Mot $r Rotors ...c.......................... 9
- 6. Motor Brakes..,............................. 30
- 7. Motor Leads, Connections and l 11 Terminations ............................ )
- 8. Motor Internal Overloa'ds (Thermogards) .... 12 l (
l
- 9. Motor Heaters .............................
13
- 10. Lubricants ................................ 14 1
- 11. Gear Box Relief V Ives .................... 16
- 12. ;eals and Gaskets ......................... 18
- 13. H(ndwheels ................................ 19
- 14. Local Position Indicator (LPI) ............ 20
- 15. Limit Switch Compartment Orientation ...... 21
- 16. Limit Switch Compartment Cover and Gasket Materials ...................... 22*
- 17. Limit Switch Compartment Drains /
Seals / Conduit Connections ............... 23 FIGURE-I .................................. 26 L t 0
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I TABLE OF CONTENTS (continued) SECTION TITLE PAGE
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- 18. Terminal Blocks (Power and' Control) .. .... 27
- 19. Wiring Connections ........................ 29
- 20. Actuator Wiring ........................... 31
- 21. Limit Switch Materials ...... ............. 34
- 22. To rque , il t ch Ma t e r i a l s . . . . . . . . . . . . . . . . . . . 36 >
- 23. Limit Switch Compartment Heaters .......... 37
- 24. Remote Position Indicators Slidevire Potentiometers ................ 39
- 25. Miscellaneous, control Components .......... 40
- 26. E sme.oence................................ 41 27 Replacement Parts ... ..................... 4?
- 28. Recommended Periodic Maintenance and Replacement ......................... 43
- 29. Aging Analysis............................. 44 APPENDIX A LIMITORQUE TEST CONFIGURATION DATA
SUMMARY
............................... A-la APPENDIX B NUGEQ Letter Requesting Limitorque Review.. B-1 APPENDIX C Limitorque Letter Confirming Review........ C-1 an
k h ' 1ntroduction 0004643
- i Limitorque motorized volva actuators are use , extensively throughout the nuclea'r industry in ap[licatons requiring e'nvironmental qualification to 10 CFR 50.49. Clarification of the Limitorques test experience was sought by the Nuclear Utility Group on Equipment Qualification (NUGEQ) in light of ,
I recent industry attention to the environmental qualification of Limitorque actuator control viring, the various actuator configurations,.which can exist, and the spectrum of generic environmental qualification tests performed by Limitorque. The attached infc mation was developed by the NUGEQ, based on discussions with Limitorque together with information ( contained in a series of Limito'rque reports. The topics which have been addressed were suggysted by NUGCQ members as items for d i s ctis s ion .- Their inclusion in this report does not imply that they are issues which are of major importance for the environmental qualification of Limitorque actuators. The objective was rather to provide a set of consistent clarifications for each of these topics, i O
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0064644 ( ) The attached table identifles the Limitorque qualification test reports which form the basis for the NUGEO discussions with Limitorque. Relevant data associated Vith en of these Limitorque reports is provided, where appropr ate, 'in each section of this report. During a review of these sections, please note that ~6po'r't's"?:B0003 Fand TF-C327
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< ." Th'e ~ NUG EQ recognizes that a number of other Limitorque actuator tests have been performed by others by Limitorque or under proprietary agreements.
Informatio", associated with these additional reports has not been incorporated into document, this but should be referenced where appropriate to extend or modify this report's information. - ( The NUGEO recognizes that all actuators are essentially equivalent, with differences limited to cover material changes, electrical component differences (including motors, terminal blocks, torque switch and limit switch materials), and the use of motor T-drains and actuator l grease-relief valves. It is, therefore, possible for utilities to modify, extend or upgrade an actuator's qualification throuar the i selective combination of applicable reports or through the use of alternate replace.r.er.t parts.
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rinally,.the Group notes that Limitorque's test reports and experience provide only one of a variety of input data sour.es used by licensees to environmentally qualify valve, etuators to the requirements of 10~CFR 50.49. A broad spec rum of case-by-case considerations and additional information are used by utilities to formulate their final analysis of environmental qualification. The i nformation contained in this report should not be viewed as restricting the use of these Limitorque reports or limiting the case-by-case considerations whi:h are necessary to adequately, address equipment qualification. s 4 L - G G &
I,[ '$ f,b l- N ^ LIMITORQUE,' Introduction - 0064646 ( ~ TABLE I (1) Project 600198 Re rt F-C2232-01 C/nuary 2, 1969 Test of Limitorque Valve Operator To Meet General Requiremerts Of An Electric Valve' Actuator in Nuclear Reactor Containment Environment (including Addendum #1,
. April 29, 1969)
(2) P"oiect 600376A Report F-C3441 May 13, 1976 Nuclear Power Station Qualificat on,g Type Test Report Limitorqu ActuatorsForBWRService{.V (3) Project 600456 Peport 600456 December 9, 1975 Nuclear Power Stat' ion Qualificat on \ ype T Test Report Limitorque Actuators For PWR Servic,e{/je v*, ( (4) Project 600426 Report is0009 April 30, 1976 Qualification Type Test Report Limitorque D.C. . Va ActuatorsForNuclearPowerStationServiceConditions,h'li6 t 1/These reports are also provided as appendices to Limitorque Report B0058, Limitorque Valve Actuator Qualification For Nuclear Power Station Service, January ',1, 198T. ( iv
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0064647 I3 Project 60'0461 Report' B0003* j' June 2, 1976 (5) w - .. - Qualification Type Test Report Limitorque Valve Actuators In Nuclear For Class IE Service g tside Primary Containmen , Power Station Servi j . February 1972 (6) Project 360160 ! QRep'oi* tIF'-C 3 2 7'IP,~)
. . ., .. . . . . . . . . . .. . S I - l 1 .,.*;" r Quali f ica~ tion: Test of A'Limitorque. Valve.: Actuator?In A. Steam.]
. Env i ronm e n t " ~ ~ ^ * ' ' ~ ' ""
(7) Project 600508 Report B0027 August 31, 1978 Limitorque Valve Actuator e'tperature Related To High Superheat AmbientTemperatures}p i (8) Project Report B0212 April 10, 1985 Nuclear Power Stat' ion Qualification Type Test Report Limitorque Valve Actuators With Type LR Motor for Westinghouse PWR , ( (9) Project 681041 Report B0119, Rev. 1 November 10, 1982 Qualification Type Test" Report of Multi-Point Terminal Strips For Use In Limitorque Valve Actuators For PWR Service 1/These reports are also provided as appendices.to Limitorque Report B0058, Limitorque Valve Actuator Qualification For Nuclear Po.er Station Service, January 11, 1980. b v 6 _ .m. _ _ _ _ . _ . _ _ _
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- 1. Actuator Size:
. Limitorque philosophy is that a full range of actuators are quclified by th,e mid-size actuators (SMB-0) which have been used in all EQ testing. This range ine'.udes the full spectrum of SMS and SB units.
In Section 2.1 of Report B0058, Limitorque states:
"The qualifications were conducted to encompass the. entire family of Limitorque actuators - SMB, SB, SBD, and SMB/HBC in all available unit sizes (SMB-000 to SMB-5). This was accomplished by conducting the. qualification testing on a mid-size unit (SMB-0) subjecting the actuator to sim-ulated seating loads equivalent to the actuators published unit rating during the test procedure."
[ Actuator Size Data: (1) 600198: SMB-0-15 (2) 600376A: SMB-0-25 (3) 600456: SMB-0-40 (4) B0009: SMB-0-25 (5) B0003: SMB-0-25 - (6) F-C3271: SMB-0-10 (7) B0027: SMB-00-15 (B) B0212: SMB-00-15 (9) B0119: N/A (used as a fixture only) L _____m__._ _ _ . _ _ . _ _ _ _ . _
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0064649
- 2. orientation:
All actuators tested by Limitorque vere oriented with the limit switch compartment vertically up, the motor _.h ,izontal and actuator stem, horizc.nt'al. Based on experience, h storical data, and screening tests, this position was selected by Limitorque to represent the v'rst o case position. The basis for this selection vas to expose the motor (as the lovest electrical component) to the highest levels of moisture collection and steam intru, ion. l In Section 4.1.3 of Report B0058 Limitorque states:
"Thermounting position of the actuator was chosen with the limit switch compartment up and the motor horizontal. This is considered the worst I possible position because it allows any conden-sate that collects in the unit to flow through the motor to provide the most damaging effect on its insulation system."-
( Limitorque, based on its testing and analysis, considers actuators qualified for all orientations, but installations with the motor or limit-switch compartment aligned vertically down should be minimized. Although environmentally qualified in these orientations, unanticipated failure of certain seals or gaskets during normal or accident conditions could permit grease to I accumulate in or on electrical components, l l l L
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- 3. Motoi size / Manufacturer:
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.,,j AC,,w. mot"o}s,j the Limitorque t es t eci motor .i , the same manufacturer / design which is supplied with the uni s certified to the applicable test report.
For the Class B units tested in B0003 and F-C3271, the pur-pose of the test was to demonstrate t!ne inherent capability which exists in generic commerical grade UL standard Class B systems to function during the tested conditions. During the B0003 test three motors of different manufac.turers were tested. N{clidd TI8 33C1kQTQ$3@NM3.2N2N Lj.1$.%9_,9fM6Y j,
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ytv.tse We...MQQ-( Limitorque noted that Peerless $ ass B AC motors have not been supplied since approximately 1,973.1 l l l l 1/ Al t houg h . no t .....f o rm a l l y incorporated $,into._thissummary, pleas g l note.that.a.. Peerless Class B AC motor with' Dings brake was2 tested in WCAP 7410-C,' Appendix D (F-C 2485-01)
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.w .4 0064651 Motor Data:
1 (1) 600198: Reliance Rad H (nameplate "H"), tconnected to unit), dual voltage, AC 2 - Reliance Rad H (nameplate ) with Dings brake (operated in chamber)', dual voltay., AC (2) 500376A: Reliance RH, 1800 rpm, dual voltage, AC
- (3) 600456: Reliance RH, 1800 rpm, singic voltage, AC (4) B0009: Peerless RH I: :it pla t e "H" )', DC (5) B0003: R=liance B 'c..nected to actuator), dual voltage, AC Electric Apparatus B (onerated in chamber) AC Paramount B (operated in chamber), AC (6) F-C3271: Reliance B vith Reliance brake, dual voltage, AC
{ (7) E9027: Reliance RF., AC (8) B02)2 Reliance LR, single voltage, AC (9) 30119: N/A 2/Limitorque no longer supplies Reliance Rad H motors certified to 600198. The replacement Reliance RH motors are supplied with certification to 600376A, 600456, (or 600196 if requested). No RH motors, provided with brakes, will be
' certified to these reports (See discussion of motor brakes),
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- 4. Motor' Orientation /T-Drains: ,
i All tested motors were horizontal, motor 'T-drains were utilized in certain tests as tabulated below. T, principal purposes for use of the'T-drains were, 1) to provi e drainage of internal actuator condensation; and 2) to -serve as the primary vehicle for internal-to-external actuator pressure equalization.
- The T-drains were the principal pathways for steam and moisture intrusion into the actuator. In order to fu'nction as drainage pathways, the motor T-drains should be installed at the motor low point ports. ,.
For motors covered by tests utilizing two T-dra'is, their location should be as follows: (1) motor principal axis horizontal - one (1) T-drain on each motor-end bell at the lowest avail 3ble point. If { the motor lead wirevay to limit switch compartment occupies one of these positions (e.g., for a horizontally mounted motors with limit switch compartment facing down) it vill function as a motor drain. In this case the associated T-drain may be omitted or placed at the next available point to facilitate motor drainage. L l
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lowest motor-end bell. (Four plugged ports are typically provided in each end bellbhic,canbeused
- to locate the T-drains).
For actuator motors tested with one motor' T-drain, it should be placed at the lowest available end bell port. Multiple ports are not typically provided in these motors. Plugs should be installed in unused end-bell ports.
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1 %g Limitorque notes tha't all teste' actuators vere essentially equivalent with electrical component differen es limited to ( motors, terminal blc'cks, torqu'e and limit switch materials. Terminal blocks are generically addressed 80119. 'T5Aa[d w d"dSTEc33fdEidCS!a tgggty4po tg ejgagp,]![LS_2Tcb WaMGYsilablic321%avnW29ExortweM$G5.9%s2E#oB M w n Hel w v m grdxunguep e sai m m .,ton eupgrA - - mmm n. > 6 E _.ido1agaetuator,':srf men.tAnonotors al: y - p%yyr -w,canm.-#-msum.onr.t ouno r e : r e c<en,Tutsi:ir.IsTR1Jf"i=t,ea_m_sg j , voYimotorms.qualifi , 7.13H5]M'.Nro76EhYciTe $ N M fr[w h Tjd[rgpyj g ( Eeh 4 4 9
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3/The NUGEQ notes that in locations which do not experience temperature and humidity increases due to steam line breaks (e.g., mild environments or radiation only harsh environments) ( the pressure equalization and drainage provided by the T-drains vould not be necessary. In these cases, the NUGEQ believes the absence of T-drains is justified. The omission of T-drains in other situations vill not 'necessarily prevent proper actuator operation or violate environmental qualification. Examples of situations which, based on utility-specific analysis, may be considered acceptable include:
- 1) Operability only required for a short duration j immediately post-accident, or l
l 2) Motor orientations which would preclude moisture collection in the motor (e.g., drainage into the limit-switch compartment would occur), or ! 3) The required environmental parameters are bounded by i other reports (e.g., 600198, B0003 or F-C3271) which l did not utilize T-drains. Since' the RH and LR class insulating systems which were tested with T-drains are considered superior to the- Rad H and B Class systems, i this extrapolation of the 600198, B0003 and F-C3271 reports can be made. l
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Page 8 0064655 - Motor *T-Drain Data: -
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- 5. Motor' Rotors: ,
l Magnesium otors only exist on certain Reliance'AC motors. Both aluminum,and magnesium rotor motors, have be, tested as tabulated below. Since' magnesium rotor motors ac ptably passed the 600456 and B0212 steam test conditions, Limitorque has concluded that fotor materials do not affect the level of motor qualification. 'Limitorque certifies the performance of magnesium
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rotor motors to all referenced tests. If requested, Limitorque vill provide for a fee, utilities with information on rotor materials for installed motors. Limitorque requires the motor ID number (serial number).
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Reliance may also be contacted to provide this information. Ig ggeg&yylgagcgggggg;gggssdrexr @ ? m m m En , s iz M C ank*kQgl$??R2Ed*' 2'*"Ni#""' FRAME sizes. , 1 Limitorque is not. completely aware of details associated formed with the GE/Wyle testing which the-basis for issuing IEN 86-02. Maonesium Rotor Motor Data (1) 600456: magnesium (2) B0212: aluminum (connected to actuator) magnesium (opera'ted in chamber) (3) all others: aluminum L I
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] Reliance motors with brakes were tested in_600.198 (Dings brake) and F-C3271 (Reliance brake). 'In both ti , the units i'
successfullj functioned during thei test conditions and are - considered by Limitorque as-qualified to these reports. pvas noteddhygaduat4pn -
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Na'hTdFrRthMpT.Mcu@gppJgagnw. b}ou7d]ggaDaky d Due to design improvements, Limitorque recommends j replacing / modifying SMS actuators requiring motor' brakes with the
- SB design. Although the actuator modifications may be performed.
in the field, Limitorque recomr. ends factory modification. Limitorque'sfactorywilisupport refueling outage schedules. 'I t vas noted that replacement SB units are slightly heavier than the ( equivalent SMB unit.
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! *f1e adMpge nt s M i n t rg go t he r1gpqt eprtt i a lm p tokli t siI73Ef6d3']n353 4 sommen1deed, Simple de-termination of the brake leads does not render the brakes inoperative and in fact vill make the-brake drag. f CiY5TEb'MBIf$tidN!'hIO5EEtEs5p"p~l'[EYeh5 AcemenE((d1 s-?y~ -i n :; ; 1 : --L' .u,
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- i' Hotor Brake Data-l (1) 600198: Reliance with Dings brake (operated in.
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(2) F-C3271: , Reliance with Reliance brake , (3) all c*.hers: no brakes I
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- 7. Motor Leads, Connections and Terminations:
All motors are supplied with leads identical to those used in the referenced test motor. To avoid motor.!1 d abrasion Reliance RH motor leads are covered with a heat shrinkable polyolofin which was included in the tested configuration. All tested ' motors had their power leads terminated with
- crimp-type lugs to the power terminal blocks located within the limit switch compartment. Since dual votage motors were tested at the higher voltage rating (460v), splicing of certain leads was necessary. /Limitorque fabricated the motor test splices in accordance with its factory standards which utilize insulated blind barrel crimp splices in the same produce families as the crimp-type lugs. (See Section 18, Terminal Blocks, and Section t'
19, Wirinc Connections, for further clarification). Unless otherwise reques ted in the applicable purchase documents, Limitorque provides motor leads terminated per the referenced test report. Limitorque indicated that motor terminations utilizing nuclear grade splices, qualified by i others, are also considered an acceptable termination method. 1 l l l l (
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- 8. Motor Internal Overloads (Thermogards):
Limitorque i ndicated that to the best of their knowledge integral motor overloads have not been supplied o >any nuclear grade motors certified to the various Limitorque test reports. m. e ( . G L
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0064660
- 9. Motor' Heaters: ,
/ The motor heaters are small flat discs which are attached within the motor-end bell with leads extending int,the limit-switch compartment.
QMghoMJncwc e dgAanjTEWTn_iEeMlloN I g52W g ingyggp g g g g 1gigque. If requested in pur-chase documents, they have been provided in nuclear-qualified
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Limitorque recommends that the heaters only be energized during storage.- Limitorque has not analyzed the effect that the heaters may have on environmental or seismic qualification, but offered the following per'spectives: (1) If energized, the heaters could increase the motor ( ambient temperature. No data was available, from Limitocque. The effect on motor qualified life, or survival under DBE conditions, has not been analyzed by Limitorque.4 (2) Un-energized heaters should not affect environmental qualification due to their location and materials of construction. (3) Seismic qualification should not be affected by-the presence of the heaters due to their low mass and loca-tion. 4/A review of B0058 suggests that for most applications an acceptable qualified life (40 years) with substantial margin should still be available for units with minor temperature ( in:reases above typical plant ambient conditions. See B0055, L Se~ ic r. 3.2 Therrc.o1 Acing. a
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.t' W A m TX %A M c 08 c46'61 r 10. Lubricants: , ] Lubricants that can be used in the Limitorque actuators are identifi.ed in the appropriate instruction manual and, ubrication Data Form LC8. The actual greasesjutil'ized du ing Limitorque testing are tabulate'd below. Other lubricants with the appropriate properties may be substituted -for those tested or certified by 'Limitorque; however, testing, analysis and qualification of these substitute lubricants should be established by the user.
Qm a i nM#Er Eox'~eWTihEEtMe[d;i.[ ate"Tu' pp1 i edi--f o r ; iQ
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d bula'EP1Ycan'~be'.mmiYed
. m -m me.m. ~ . . .
T-Ql't M. ...,.n .. ,v._r _ ,.,._rZusedain2 place- ~% of.sthe EPO Limitorque does not recommend mix.ing the Nebula EPO and EPl with ( any other type lubricant. r This - lubricant is light tan in color and appears to heve a sm'ooth texture. aK wF6r[S.MB-000r SMB-00.:m. O- - nE ~ _.a. S.MBp ,5 . a c t u a t o.<r's- ~.
.certif,ied m.axto the)
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w . .< .w p@ %.luBricatedewi %q;% v.r%pa th: Sun Oi17 Company 50:EP;(XC-4 =S'213-39)'. " insEe'a. d 3f_the2
~
- .: ; =.. ' 4y:m2 u.s U$ibn~ Neb _ulas5,Ide'nt isf i ed. E~'o'r 'su
% ..m. , .
ab.~o.ve._. i EI'iNi tdrju'.%..ig i nally&.ppl i~
-- ~
./the^ -Sun' Oil'for the out-of-containment
~
- m n .:.. . m s, ,. _
c-w ettified.SMB-00-an'd SM'BF 0' .0 0. .Tu n i..t s's'v i t h . s e r i a l numbers -. m -belov'.:.2.95810, & ,.TheOSun 6ff N J
~n.- *w - Lem _: ;,ew .. - --
l IIQubr..ib..a..:nt
.es. con.t - i.nues .t+o . be...... - - - - us - - ed f o.r. .out-o f-con,t a i nmen t - Ce r,t i f i.
g
,.SMB-5' units.* This' lubricant shall notU.be. mixed with..the-Exxon
',' " ~ ~ ' ~ ~
~~ " -; h r e w .r x ... ..... m u
'c Nebulas - - - - 'and. it"is -, rec _ommended ....a._.that.a.utiilities use Exxon- Nebula. EPd sf.ogpJJ.;;.ap.o l..i c a.t i ns . .
o.s.iwt ~h.,,th e.. e x c e p t.i ort o f- SM.B '$. Limitorque has e E I
-- _ .- . . . _ . . ._ _ . . _ - , - . _ , _ , _ . - _ - ~ . - , . . . _ ,...
F QM d;Qsnmu@n@kdV . .E&gh, m r: m: .. ;kg.e :
md W LIMITORQUER 4 < *
;gy .2'- . " t '-
0064662 Pc90 l.o subjected 'the . Sun Oil EP to 225 megarads ,and performed an independent analysis on the grease's lubricity. The anal'ysis indicated acceptable performance of the, Sun Oil grease. The Sun Oil lubricant is black in color with a stringy texture. kiguel,ha's3s_tJLandisuppli.ed4 eacond25JddioRQ. B
. r'dases f o r, ther.. limi t + svi tch ' gear 9 hous i ng .?T'~. The
"-~ ' " "' Mobil
" " ~ _28.[i s#
. df>M; rum c ~> * " -nmwk '
gedd Lsjl-brovnt i'n7 ciildr'.? 'TThfBeaconh3l25_iss ac. Lighkg rey /be ig et Limitorque noted that the Beacon and Mobil greases should not be mixed. Finally, Limitorque suggests that the Mobil 28 be used in applications where normal operating temperatures are greater than 150 0F, Lubricant Data: (mai'n gearbox / limit switch gears) (1) 600198: Humble Nebula.EPl/ Beacon 3255 ( (2) 600376A: Exxon Nebula EPl/ Beacon 325 (3) 600476: Exxon Nebula EPl/ Beacon 325 (4) B0009: Exxon Nebula EPl/ Beacon 325 (5) B0003: Exxon Nebula EPl/ Beacon 325 (6) F-C3271: Humble Nebula EP1/ Beacon 325 (7) B0027: N/A (8) B0212: Exxon Nebula EP0/ Mobil 28 (9) B0119: N/A 5/The original Humble Nebula is equivalent to Exxon Nebula since Humble was accquired by Exxon. L 1 f
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LIMITORQUE, a
- 4- Page 17 4cw-0064663-
-r -
Gear B x Re-lief Valve Data:l ' (1) 600198:~ Installed-- -, (2) 600376A: Installed. ' (3) 600476: Installed-
~(4) B0009: ,
Installed (5)- B0003: Not Installed (6) F-C3271: Not Installed (7) B0027: Installed . (B) B0212: Installed (9)- B0119': Installed e O L
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- 12. Seals and Gaskets: . _
Per Limitorque, the seals and gaskets are not critical tg qualification since the actuator does not depend on absolute sealing to survive DBE conditions.7 Limitorque suggests that the same type seals and gaskets, as used in the referenced test configuration, be used during plant operatiors. In B0058 Section 3.2.3 Seals, Limitorque states:
"Limitorque actuators for Nuclear Plant application are designed to permit them to survive normal and accident conditions without depending on absolute sealing. In fact, the ambient- is not absolutely restricted from entering the actuator. The seals are of no importance for qualification and, therefore, require no consideration for the qualification."
Seals / Gaskets Data: (Seal / Gasket) (1) 600198: Viton/ Anchorite ( (2) 600376A: Viton/ Anchorite (3)gM M 7 g g,eg[ Q @ Q Q (4) B0009: Viton/ Anchorite (5) B0003: Buna-N/ Anchorite (6) F-C3271: Buna-N/ Anchorite (7) B0027: N/A (8) B0212: Viton/ Anchorite (9) 30119: N/A 7/All inside-containment qualification testing was performed with Viton seals whereas Buna-N vas used during outside containment testing. Viton was selected for in-containment applications due to additional material margins to failure. Viton seal - o f NM 2hl L
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LIMITORQUE-
- ^
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- 13. Handwheels: -
The use, location, and configuration of handwheels do not appear to have an effect on the units' environmental qualification. Limitorque has been unable to develop any handwheel failure mechanisms that would preclude the actuator from performing'its function. i V O
.____.____m _ . _ - _ _ - . -
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0064666
- 14. Loca1' Position Indicator (LPI): ,
) Unless required. by. procurement documents, 'LPIs are not normally supplied on environmentally ,ualified q units. However, an LPI was installed on actuators tested in 600198 and 600376A.
Installation of the LPI does not affect the qualification of actuators certi.fied to other test reports.. T'he LPI is a gear-driven mechanical device which is attached to the limit switch compartment. It has no safety function; nor should i ts performance affect other actuator components. Limitorque notes-that since actuators-vere qualified with moisture intrusion into the limit switch compartment, physical integrity rf the LPI vindow is not critical to' actuator. performance. LPI DATA: , { (1) . 600198: LPI f . (2) 600376A: LPI (3) 600476: NO LPI (4) B0009: NO LPI-(5) B0003: NO LPI (6) F-C3271: NO LPI-(7) B0027: NO LPI
-(8) B0212: NO LPI (9) B0119: NO LPI L
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- Q N[*d
' 1TLI,MITORQUE' I. .
f' Page 21' 0064667
- 13. Limit' Switch Cogpartment Orientation: .
As previously discussed, the orieritation of all tested actuators was with the Limit Switch Compartment (LSC) vertical at the top of the actuator. In this configuration, excess t condensation drained from the limit switch compartment into the motor housing via the actuator's internal motor lead wirevay. TgaW8rquT2Ydfdi3NAst3Mr[q[fytqEE,I,*obilled,.t,he. nniwf-ow. N M gig rengjgfohs. l l l l L
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- EPage?22 Lli41TORQut t
- 16. Linit Sv i t tii Compartment Cover' nd Gasket Materials::-
(
) Both the aluminum and cast-iron Limit Switch Compartment (LSC) covers supplied by Limitorque have been tested. Since Limitorque has not tested aluminum covers for PWR chemical spray conditions, it is recommended that the actuators for PWR in-containment ' applications use cast iron covers. 8 The LSC gasket, in all applications, is Anchorite Part #425.
Limitorque noted that this gasket material is permeable to gases, possibly including steam. See additional discussion under e Section.12, Seals and Gaskets. LSC Cover Data: (1) 600196: NO DATA (2) 600376A: CAST IRON ( TTQ@lINX5W18 dii (4) B0009: CAST IRON.
~
T3iEEiEBUU6'3f*NAC1FQ% (6) F-C3271: ALUMINUM (7) B0027: CAST IRON (8) B0212: CAST IRON (9) B0119: CAST IRON 8/ The NUGEQ notes that the concern with cluminum in this application is the effect of the long-term caust;c spray on .e cover material's integrity. If adequately analyzed oy utilities for external corrosive effects, aluainum covers may ~ be acceptable for PWR in-containment applications. L 1 1
- _ _ _ - _ _ _ i
L $1 TOR U Limit Switch Compartment Drains / Seals / Conduit Connections: ( 17 For tests utilizing motor T-drains, the external test environment entered the limit-switch compartment from the motor housing via the motor l'ead wirevay. For actuators tested ithout J motor T-drains, the axternal steam environment entered the r actuator via the gas permiable Anchorite gaskets and via the conduit fittinga which were not installed to provide pressure-tight seals. Limitorque noted that in all the actuator tests without T-drains, moisture and steam intrusion was evident from the small pool /of condensate that collected in the LSC. For tests without T-drains, pr?ssure recordings document actuator pressure equalization at test-chamber pressure and demonstrate that leakage occurred in all referenced tests. It was also noted ( that in the 600198 test (which tested units without motor T-drains) a 9-hour preliminary steam test was performed by piping live steam into the LSC vie upper conduit taps and draining 5 condensate with an open lover conduit tap. That report indicates that the test was successful with no noticeable effect on the function of any parts in the LSC. In all the Limitorque tests, the existence of moisture inside the unit did not prevent adequate actuator performance. During the testing, test leads (both power and control) exited the LSC via two conduit openings (one for power and one for control). The configurations of these openings are tabulated below. Unused oper.ings were closed with threaded pipe plugs. No C ___.......m_....
^
I [f Page 24-external Cimit._ Switch Compartment.. (LSC) drains were-provided J during any of the referenced EQ tesis. As previous'l'y discussed, for the tested configurations, excess condensation during testing drained from this compa^rtment via the internal.wirevay into the m
'otor housing. The exact location of the wirevay varies with actuator model number (SMB-0, SMB-00, etc.), but .is located roughly at 3/4 'of the compartment height when the LSC is mounted horizontally. (See Ficure 1 attached.)
For installations that -reference tests utilizing -motor
-T-drains, Limitorque ~ indicated that the use of LSC drains although not required does not affect qualification since, during _
the tests, the external e'nvironment enter the.LCS via the motor. T-drains. ( LSC Conduit Interface Data:. Three conduit viring conf,igurar. ions were used in the various tests at follows: TYPE A Non-nuclear grade Conax seals at bot-h the limit switch compartment conduit opening and test at-chamber vall. - TYPE B Non-nuclear grade Conax seals at- test chamber vall. High pressure teflon hose threaded to both the Conax seal and the LSC conduit openings. The teflon hose was used to minimize abrasion to the internal test viring during- the qualification testing. TYPE C Non-nuclear grade Conax seals at _ test. chamber vail. Steel tubing with threaded fittings connected to both the Conax seal and-the-limit swit ch compartment ' conduit opening,- The purpose of- the t ub i r.g was to- minimize wire abrasion during testing.. (. i- -
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0064671
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(1) 600198: TYPE C . (2) 600376A: TYPE A _ (3) 600476: TYPE B (4) B0009: TYPE B (5) B0003: TYPE B (6) F-C3h71: TYPE C (7) B0027: TYPE B (8) B0212: TYPE B (9) 80119: TYPE B e l t i I \ i l I l l
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FIGURE -1
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- 18. Terminal Blocks-(Power and Control): ' ~
Terminal Blocks were used in all-Limitorque tests to inter-face the motor power leads with the test chamber wires. Terminal Blocks were not used in any-Limitorque tests for control circuit viring. The wire termination points, which are integral. parts of
. limit and torgue switches, were qualified as part of these assemblies. Limitorque terminated the test chamber control wires directly to both the limit switches and l torque-switches, and developed the necessary circuit interconnections (jumpers) external to the test. chamber. Testing in this manner facilitated monitoring of individual switch performance.
In addition to testing power terminal blocks during_the standard Limitorque tests, a spec'ial test'B0119 was performed to i C specifically test the range of terminal ' blocks and crimp-type terminations .used by Limitorque. During the testing,. IR measurements. vere made and
~
, actuator -operability -verified to determine the level of performance' provided by the various terminal block types. --
Limitorque stated that it vill certify the performance of terminal blocks to the applicable test reports including B0119. Limitorque also noted that it vill certify' terminal blocks _to , other reports based on' material similarities and-comparable performance' in.the-B0119 testing. L
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LIMITORQUa r V+P - e
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Oh6k674- / Page 23
,.s._,.-
' MA.MYE M*MNb' fj$;8gs g, adjacent, for power viring in subsequent Limitorque tests. BoEhi-r heavy
'DilUt[ff[93hn t.h'EfdijigsgnggrypK{emggpgs4g ,
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$1.9j[f> a l't'if.ria.t eK@y[h d [a gvygigggo,e,s,),pno,tflffeet the performance or level of qualification provided for the Marathon 300 blocks based on the 30119 testing.
Finally, Limitorque stated that the use of environmentally qualified splites in lieu of terminal blocks, in both power and control circuits, was an acceptable configuration. Terminal Block Data
"(1)' 600198:
Buchanan 0524 (adjac~ent)? [ (2) 600376A: - Buchanan 0524 (adjacent) (3) 600456: - Marathon 300 (alternate)
- _ I (4) B0009: -
Marathon 300 (alternate)
.y... - .
' ( 5 ); B0003:e -
Marathon 300 ( altei nate)l.' 9 (6) F-C3271: - Buchanan 0524 (adjacent) (7) B0027: - N/A (B) B0212: - Marathon 300 (alternate) (9) B0119: - Marathon 300 (adjacent) Harathon 300 (alternate) Buchanan 0524 (alternate) Buchanan 0222 (adjacent) GF, EB-5 (adjacent) Marathon 1600 (adjacent) ( - Curtis Type L (adjacent) TLM WW44% (TJn') 1
's C
$074 y;9 LIMIT,ORQUps; W "" c x,w~ /
Page 2B c w 3ttunolatcausmeyeggggggapqtntMEwalegggt_egv~g, - adjacent, for power viring in d subsequent Limitorque tests. gs Di N @3330IE31.gjpe7pyj g ggyggyopy g g gby g p hat gh,'eTure.[of7/i5ltM~ n .- _ .E.. 7~0s.7.T:ra d
- u. x j acen tg vi,q i nggdoe ggpp,ye.~, s nnot/.
. a f f ec t the performance or level of qualification provided for the Marathon 300 blocks based on the B0119 testing.
Finally, Limitorque stated that the use of environmentally qualified splites in lieu of terminal blocks, in both power and c*ntrol cir<aits, was an acceptable configuration. grminal Block Data I(1) b00198:
~
Buchanan 0524 (adjac'ent)? [ (2) 600376A: - Buchanan D524 (adjacent) (3) 600456: - Marathon 300 (alternate) i ' (4) B0009: - Marathon 300 (alternate) t
.(5)
B0003: -- e .. 3
-- Marathon 300 (alternate.)..
(6) F-C3271: - Buchanan 05'24 (adjacent) (7) B0027: - N/A (B) B0212: Marathon 300 (alternate) (9) B0119: - Marathon 300 (adjacent) Marathon 300 (alternate) Buchanan 0524 (alternate) Buchanan 0222 (adjacent) GF dB-5 (adjacent) Marathon 1600 (adjacent) Cur:is Type L (adjacent) ' TL.M M*t) %%. (YJ nN
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Page 29 0064675
- 19. Wirin'g Connections .
~
) Limitorque stated that only three types of terminal lugs have been used in the fabrication of Limitorque actuators
! (including the tested units). These are: Thomas and Betts: RB873 Burndy: YAE-14N53 Hollingsworth: XSS-20826 Crimp-type lugs vere used to terminate motor leads during all Limitorque testing. The exact type of lugs used in each test was not formal,1y documented. Limitorque, however, has included the 3 terminal-lug types in its B0119 testing. Although not
~
stated in the report, sach lug was attached to a short length of stranded wire. At the conclusion- of the test, the terminal lugs ( vere evaluated and the following bbservations made: (1) The resistance across the crimp joint was measured with an ohm-meter as "0" ohms. l l (2) The ir.tegrity of the wire joint crimping was retained. (3) Surface cracks were noted on the terminal lug insula-1 tion; hcaever, all insulation remained intact. On the basis of these observations, Limitorque concludes that the terminal lugs utilized by Limitorque are gaalified te all test report service conditions based on the performance demonstrated during the B0119 testing. L
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'Page 33
~ 0064676 r CrimNLuo' Data '
- .~
(1) B0119: Thomas and Betts: RB873 .- Burndy: YAE-14N53 Hollingsworth: XSS-20826 (2) All others: One of the above 3 types was utilized but not documented . k e 9 G 4 - = 4 (
l '
$ 0 Qh'b.f$bfllcl's.;p;k'[.ky; LIMITORQUE. , , y, y1 .
y( ly' .. ,' ,L9Af ,; l?$'. Page 31 Actuator Wiring: 000L1677 20. Iki Limitorque confirmed previous Group information regarding power and control viring as follows: (1) No power viring, other than integral motor leads were tested or are used by Limitorque. (2) Control viring was not qualified by Limitorque as part of itr, actuator testing. Limitorque has supplied different types of internal control wire based on various factors including procurement documentation , 1 requirtments. Table 1 provides a general categorization of the viring types used. Limitorque has used Raychem Flamtrol, Rockbestos Firewall 111 and vire specified as Canadian Standards Association (CSA) Type TEW vire f,or the limit svitch compartment jumper and control circuit viri 6'g. Limitorque's selection and { use of the Raychem and Rockbestos viring was based on the availability of separate vendor qua)ification test reports. The
. CSA type TEW wire and its various equivalents (e.g., TW and TFF),
whb;h are PVC insulated, hcVe historically been used by Limitorque for all commercial-grade Limitorque actuators. Limitorque likely used the TEW for all actuators fabricated prior to 1970 and for all pre-1978 safety-related, outside-containment actuato*s. L M l 4 $ 3k_ / ,
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Page 32 Listrong;s 0064078 l
~
Limitorque. stated that it was not the. purpose of the ; (l Limitorque test reports to qualify control viring, and that ' the vires must be qualified separately based on other test reports or analysis. ror procurement of a new actuator Limitorque indicated, M requested, it vould identify the specific viring used and the test report which Limitorqua believes is applicable. i i l l L f
tis:To?.out 0064078 Po9" 22
~
Limitorque- stated that it was not t h e. purpcse of the (" Limitorque test reports to qualify control viring, and that the wires must be qualified separately based on other test reports or i analysis. For procurement of a new actuator Limitorque indicated, if reguested, it would identify the specific viring used and the test Ieport which Limitorque believes is applicable. l I L
^
x!,* : ,,. ,';. - LIMITORgUE , Page 33 0064079
. TABLE I -
l TYPE l PkE 1970 l 1970 -1978 l 1978 - PRESENT l l l l l l l 1 I I I IStandard ,i TEW l TEW l TEW I lActuators l l l l l l l l l
. IIn-Containment l TEW l Raychem or l Rockbestos I lActuators l l Rockbestos .I l l l l l 1 lOutside l TEW l TEW l Rockbestos l l Containment 1 I I I lActuators l l l l l / I I I l Notes (1) TEW denotes CSA vire designation TEW which is 105 C PVC insulated viring. Recent plant inspections and Limitorque research have indicated that types TW and TFF, which are PVC insulated 60 F viring, have also
( been used. Equivaleht wire and insulation design permit substitution of these various PVC insulated types. . (2) Raychem denotes Flamtrol viring. (3) Rockbestos denotes Firewall III chemically or radiation eriss-linked viring. (4) Prior to 1973-1974, Limitorque records will likely not l identify the type of viring which was used. Limitorque believes that it is highly likely that PVC viring was I used for all actuators except safety-related in-containment units. It was Limitorque's policy after 1970 to use Raychem vire for units clearly identifled as safety-related in-containment units. Limitorque records after 1974 vill document the type of viring utilized. l o (
" "lig . ;t . , .
LIMITORQUT. , pag'e 34
- 21. Limii Switch Materials: ,
Limitorque stated that all i n-containment tests were' con- , ducted with a bronze intermittent gear limit switch housing 9 All outside containment tests utilized an aluminum housing. The limit switch aluminum housings which are anodized appear as a smooth bronze-colored surface. The bronze housings are sand cast and ap*peur as a pebbly-bronze surface. Limitorque recommended that utilities ma'intain field actua-tor configurations which are consistent with the referenced test report. However, bronze limit switch intermittent gear housings are acceptable for all applications. The limit switch 'non-metallic tested in all in-containment reports, except B0212, was a v,hitish-grey Melamine. The B0212 (
~
test utilized a brown Fibrite proprietary meterial. Helamine is no longer available. All ,repl6 cement parts nov supplied by Limitorque utilize the Fibrite material. Limitorque vill certify the Fibrite to B0212 or any report which originally utilized Melamine. 9/The original 600198 test was unsuccessful when an aluminum hous-ing was utilized. The subsequent Addendum 41 testing utilized the bronze housing. 4 4 _._.m_ _ _ _ _ - . _ _ . . . _ _ m_ _ _ _ _ _ _ _ _ _ . _ _ _
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Page 35
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( LIMITORQ'JE ' - , 006468,1 Outside containment tests utilized a red or black Durez
~( phenolic. The phenolic material continues to be used for )
replacement parts. The Fibrite or Melamine material may also be used on units certified to the outside containment reports. Limit Switch Material Datas (1) 600198: Bronze / Melamine
', (2) 600376A: Bronze / Melamine (3) 600456: Bronze / Melamine (4) B0009: Bronze / Melamine (5) B0003: Aluminum / phenolic
.7 (6) F-C3271: Aluminum / phenolic (7) B0027: Bronze / Melamine (8) B0212: Bronze /Fibrite (9) B0119: N/A f 0
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- 22. Torque Switch Materials:
Torque switch non-metallic materials for both test and field units are identical to those utilized in the limit switches (eg. Helamine, Fibrite, and Durez phenolic). Limitorque has utilized and provided aluminum, aluminum with bronze bushings and all-bronze construction for limit switch units certified to the
. various tests. AFEE N Jyp@ @ ff5yT.uCt@ @ g g uyf[71Td h k
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.julf.TifJn'aiaJhgo,]nye M$[,MWs WddeTf e EeIf Limitorquenoted that replac emer]t torque switches are now only provided in the all-bronze construction for in-containment units. Limitorque also stated that the comntercial-grade torque switches used in the outside containment tests are fabricated of aluminum and do not contain the bronze bushing. fThe i n-containment-type torque
{ switches can be utilized for a11 applications. Torque Switch Material Data: (1) 600198: Aluminum / Melamine (2) 600376A: Aluminum with bronze bushings / Melamine TlDd (0iOUICDdllIuIqYnb.IOG3fdfifdiWMdUiiEEMe2.) arm-.r mm Q^KD000 MMS,LA.1.umi numirll Nfof@T.ilifii~fTOT(I a cid rie Wsty#f p (5) B0003: Aluminum / Phenolic (6) F-C3271: Aluminum / Phenolic (7) B0027: N/A (8) 80212: Bronze /Fibrite (9) B0;;?: N/A L
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- 23. Limit Svitch Compartment Heaters: '
Limitorque did not have Limit Switch Compartment (LSC4 heaters installed during any environmental qualification tests. Limitorque has, however, conducted screening tests and evaluations of the heaters. The heaters provided by Limitorque are principally of a vire-vound/ ceramic construction, although some are of a carbon-film / ceramic construction. The heaters are stud mounted with viring bolted to two contact ears located at the opposite ends of the resistor. Limitorque had no data on the temperature ris'e created by energized heaters.10 , In November 1978, a Limitorque test was conducted by applying proper voltage to a Ward Leonard space heater allowing the surface temperature to stabillze (measured at 250 degrees F), f ( and a glass of tap water was poured over the heater (temperature meusured at 68 degrees F). This was repeated a second time, once again without ill effect. When inspected at the conclusion of the test, no damage was noted. 10/A review of B0058 suggests that for most applications an acceptable qualifted life (40 years) with substantial margin should still be available for units with minor temperature increases above typical plant ambient conditions. See B0058, Section 3.2, Thermal Aging.
w.. '
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~
ListToaout 0064684 i Limitbrque, indicated that this screening test, combined with the non-organic materials of construction, sugge'sts that' the heaters vould likely tolerate EQ-type test conditions although no certification of this capability could be provided. Limitorque stated that the heaters need no,t be energized after actuators are installed since the units are fully-qualifled without the use,of I a heaters. Limitorque has provided heaters in actuators if they were specified in the purchase documents. EQ certification of these actuators does,,not include heaters so supplied, although the heaters need not be physically removed when the actuators are placed in service. 1 L I l
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LIM *.~ORQUE Page 33
- 24. Remot'e Position Indicators Slidevire Potentiometers:
() tio Remote Posi*. ion Indicators (RPIs) were included ih any Limitorque EQ testing although RPIs were tested as part of cer-tain seismic tests. Limitorque would have provided RPIs in actuators, if they were specified in the purchase documents. The EQ certification, however, did not include the RPIs so supplied.
- Limitorque believes that RPIs do not affect actuator environmental qualification due to the low voltages used in the indicator circuit (10 volts) nor the RPI short circuit condition
(-0 ohms) whi,ch is used to indicate one extreme of valve position. l 1 L
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- 25. Misce'lla..eous control Compor.ents:
No other control components, i.e. integral sta'rters, indica-ting lights, push buttons, etc., were. included in the Limitorque EQ tests. Limitorque is also unaware of any "EQ-quallfled" Limitorque actuators supplied with such components. 2 a O
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3;y; c. Lie:Tongur. page 41 0064687
- 26. Submergen:e:
( Limitorque stated that the actuators have not been tested
)
for operation in a submerged condition. In test 600376A, th'e actuator was accidently submerged when grease plugged the test chamber drain. During that test, the limit switch compartment filled with sufficient vater to submerge the switch rotors. At that . time, the control circuits failed. Control circuit operation resumed after the chamber was drained and water removed from the limit switch compartment by air purging through a transducer tubing connection. 1 i (.
- - , .. m - , - - - - - -
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i Mb[S' LIMITORQUE , Page 42 m
., . . j 27 Replacerent Parts:
0064688 (1) Seals: Replacemen't seals are provided,.as requested, in either Viton or Duna-N (red dot on Viton seal). (2) Gaskets: Replacement gaskets for nuclear-grade service are provided as Anchorite 425. (3) Limit Switches: Limit switch replacements for reports
, using the whitish-gray Melamine insulation / bronze bodies are now supplied as Fibrite insulation / bronze bodies. Limitorque vill certify these replacements to any report utilizing the Melamine switches.
Limit switch replacements for the red / black phenolic insulatiori/ aluminum bodies are identical to the tested units and vill be certified to the applicable reports. The Fibritt' -onze svitches may also be used in this service. (4) Torque Switches: Torque switch replac" ent criteria is similar to that discussed under Limit Switches above, with Fibrite now used to replace Melamine, and phenolic still used for outside containment applications. All in-containment replacement switches are fabricated of bronze. (5) Motor Replacements: AC replacement motors are only supplied as Reliance RH class, LR class or B cless. The Rad H class used in Report 600198 is no longer provided. RH class motors are used as the replacemer.: motors for the Rad H class and will be certified to the ( applicable test report including 600198, if requested.
. All DC rep'.a:emen: motors are supplied as Peerless RH class.
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LIMITORGUE ' ' - Page 43 0064689
- 28. Re:om.iended Periodi: Maintenance 'and Replacement:
All ac.tuators were designed and tested to provide, without component replacement, a 40-year qualified life. Limitorque has
. identified in its maintenance manuals, Form LC8 and LC9, guidance on suggested maintenance practices and intervals. Limitorque stressed that these recommendations' can and should be varied based on actual field experience and histor'ical data.
Appropriately varying suggested maintenance does not render the actuator units unqualified. Limitorque further stated that all motors were designed to obviate the 'need for any maintenance. The bearings are sealed-continuous-duty units which do not require replacement. l DC motors are designed for S00 hours of maintenance-free service l l vhich should envelope 40 year apgiications. ( Limitorque stated that all motors are manufactured for l Limitorque, to Limitorque standards, by various vendors. Repairs. or revinds, on these "Limitorque" motors should only be performed through Limitorque, by the applicable motor manufac-turer. Limitorque vill only assure qualification for motors repaired in this fashion. Although repairs or revinding of motors conducted by others when properly controlled and conducted may provide an acceptable level of quality, Limitorque vill not certify those motors to its test reports.ll 11/For example, since the outside containment Class B tests (see Section 3) were performed to demonstrate generic capability, it may be possible for utilities to perform an analysis which con.bined with :hese reports, vould demonstrate the capability of metsr revir.3s performed by others. ( l t l~
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- TORO'nf. , Page 4i
..?" in 0064690 2;:. nc Analysis:
- 29. ,
d The folloOing activation energy informatio'n was provided: * (1) Motors: Reliance Class B - 0.'9 3V (generic to all Class B motors) Reliance Class RH - 1.02eV Reliance Class LR - 1.53eV (2) Switches: . Durez Phenolle - 1.02eV Fibrite - 1.78eV Me1 amine - unknown 12 (3) Terminal Blocks: Marathon 300 - 1.63eV ( T i l l 12/Tha thermal aging analysis contained in.80058, Section 3.2.2, Switch Materials, also applies to Melamine except that the 0F, temperature index of Melaming is 130 with its 50% property point reached in 7.68 X 10 hours. Forty years, therefore, represents less than 5% of its available life. l \ - 1 ( 4
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